/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
**********************************************************************************************************************/
package eu.stratosphere.pact.runtime.iterative.event;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.junit.Assert;
import org.junit.Test;
import eu.stratosphere.api.common.aggregators.Aggregator;
import eu.stratosphere.types.LongValue;
import eu.stratosphere.types.StringValue;
import eu.stratosphere.types.Value;
public class EventWithAggregatorsTest {
private ClassLoader cl = ClassLoader.getSystemClassLoader();
@Test
public void testSerializationOfEmptyEvent() {
AllWorkersDoneEvent e = new AllWorkersDoneEvent();
IterationEventWithAggregators deserialized = pipeThroughSerialization(e);
Assert.assertEquals(0, deserialized.getAggregatorNames().length);
Assert.assertEquals(0, deserialized.getAggregates(cl).length);
}
@Test
public void testSerializationOfEventWithAggregateValues() {
StringValue stringValue = new StringValue("test string");
LongValue longValue = new LongValue(68743254);
String stringValueName = "stringValue";
String longValueName = "longValue";
Aggregator<StringValue> stringAgg = new TestAggregator<StringValue>(stringValue);
Aggregator<LongValue> longAgg = new TestAggregator<LongValue>(longValue);
Map<String, Aggregator<?>> aggMap = new HashMap<String, Aggregator<?>>();
aggMap.put(stringValueName, stringAgg);
aggMap.put(longValueName, longAgg);
Set<String> allNames = new HashSet<String>();
allNames.add(stringValueName);
allNames.add(longValueName);
Set<Value> allVals = new HashSet<Value>();
allVals.add(stringValue);
allVals.add(longValue);
// run the serialization
AllWorkersDoneEvent e = new AllWorkersDoneEvent(aggMap);
IterationEventWithAggregators deserialized = pipeThroughSerialization(e);
// verify the result
String[] names = deserialized.getAggregatorNames();
Value[] aggregates = deserialized.getAggregates(cl);
Assert.assertEquals(allNames.size(), names.length);
Assert.assertEquals(allVals.size(), aggregates.length);
// check that all the correct names and values are returned
for (String s : names) {
allNames.remove(s);
}
for (Value v : aggregates) {
allVals.remove(v);
}
Assert.assertTrue(allNames.isEmpty());
Assert.assertTrue(allVals.isEmpty());
}
private IterationEventWithAggregators pipeThroughSerialization(IterationEventWithAggregators event) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
event.write(out);
out.flush();
byte[] data = baos.toByteArray();
out.close();
baos.close();
DataInputStream in = new DataInputStream(new ByteArrayInputStream(data));
IterationEventWithAggregators newEvent = event.getClass().newInstance();
newEvent.read(in);
in.close();
return newEvent;
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
Assert.fail("Test threw an exception: " + e.getMessage());
return null;
}
}
private static class TestAggregator<T extends Value> implements Aggregator<T> {
private final T val;
public TestAggregator(T val) {
this.val = val;
}
@Override
public T getAggregate() {
return val;
}
@Override
public void aggregate(T element) {
throw new UnsupportedOperationException();
}
@Override
public void reset() {
throw new UnsupportedOperationException();
}
}
}